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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The chronic exotoxicity of In-metal to algae is documented specifically by a) transformation/dissolution data, and b) chronic ecotoxicity testing on the unicellular alga P. subcapitata, which was the most sensitive species in the acute ecotoxicity dataset on InCl3 (see IUCLID section 6.1.5.).

Solubility results demonstrate that the solubility of In metal (powder) is extremely low, and that very low concentration of In ion and In(OH)3 complexes are formed in solution. Consequently, the chronic aquatic toxicity of In metal powder to algae is also very low: a NOEC of 100mg In/L was observed for P. subcapitata. (highest nominal dose tested; very low In concentrations measured in test solutions). Based on these results on the powder, it is concluded that Indium metal is not chronically toxic for aquatic algae.

The results obtained on algae testing with InCl3 and In(NO3)3 are used for the derivation of the PNEC for Indium substances and for the acute hazard assessment of In substances in general.

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

ecotoxicity of soluble In-compounds

A standard toxicity test withPseudokirchneriella subcapitataand InCl3 was carried out. This resulted in a NOEC of 321 µg In/L and a EC50 of 5025 µg In/L.